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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24dbff7a4d169f7490974e4fe84fe22b90ab8d97a0be4a51880f2b2fd19c8eba' 
  AND token = '6p7H/Gkw3kowSbK4brceoGpPAc6DYjuZZbfHBbBmzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}